Hi again,
From some quick research, I believe RPGMaker games primarily use DirectDraw and WebGL to render the games. Those games that use DirectDraw should in theory work with the DirectX 8 option, but the WebGL games will unfortunately remain unsupported. As mentioned in the other thread, I will however be creating a 'Desktop' alternative so that you can play any game in windowed or borderless fullscreen and still use the app. Albeit without full functionality due to not being able to interact with the game's code whatsoever. This desktop alternative is a high priority and I will start working on it within the next few weeks. :)